It happened to a test site when I installed WP 3.2. Upgraded to WP 3.2.1 and BP 1.2.9 and all’s well. Do you have any error messages coming up on screen?
Zero error messages at all. It would be MUCH easier if something was completely broken and erroring out but thus far it just seems that anything dynamic/sliding/expanding is completely dead in the water. I tried the fix in that thread but it’s still broken.
JavaScript caching or an error in your theme or another plugin. Check the solutions in the topic linked above.